Mattress cover



FIG. 1 is a front right perspective view of a mattress cover showing our new design;

FIG. 2 is a front view of the design shown in FIG. 1;

FIG. 3 is a rear view of the design shown in FIG. 1;

FIG. 4 is a left side view of the design shown in FIG. 1;

FIG. 5 is a right side view the design shown in FIG. 1;

FIG. 6 is a top view of the design shown in FIG. 1; and,

FIG. 7 is a bottom view of the design shown in FIG. 1.

The broken lines shown in the figures are included for the purpose of illustrating portions of the mattress cover and form no part of the claimed design. 

CLAIM The ornamental design for a mattress cover, as shown and described. 